WO2008144293A1 - Vortex induced vibration suppression systems and methods - Google Patents
Vortex induced vibration suppression systems and methods Download PDFInfo
- Publication number
- WO2008144293A1 WO2008144293A1 PCT/US2008/063497 US2008063497W WO2008144293A1 WO 2008144293 A1 WO2008144293 A1 WO 2008144293A1 US 2008063497 W US2008063497 W US 2008063497W WO 2008144293 A1 WO2008144293 A1 WO 2008144293A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- covering
- exterior
- subsea structure
- induced vibration
- collar
- Prior art date
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B17/0017—Means for protecting offshore constructions
Definitions
- This invention is related to vortex induced vibration suppression devices that can be attached to offshore structures to reduce drag and/or vortex induced vibration (VIV).
- VIV vortex-induced vibrations
- Drilling for and/or producing hydrocarbons or the like from subterranean deposits which exist under a body of water exposes underwater drilling and production equipment to water currents and the possibility of VIV.
- Equipment exposed to VIV may include structures ranging from the smaller tubes of a riser system, anchoring tendons, or lateral pipelines to the larger underwater cylinders of the hull of a minispar or spar floating production system (a "spar").
- Risers as used herein are defined to be a non-exclusive example of a marine element subject to VIV.
- a riser system is used for establishing fluid communication between the surface and the bottom of a water body.
- a typical riser system may include one or more fluid-conducting conduits that extend from the surface to a structure (e.g., wellhead) on the bottom of a water body.
- a drilling riser usually consists of a main conduit through which the drill string is lowered and through which the drilling mud is circulated from the lower end of the drill string back to the surface.
- auxiliary conduits such as, for example, choke and kill lines, pressurized fluid lines, hard pipes, and electrical lines, which extend relatively parallel to the main conduit.
- auxiliary conduits and lines are commonly referred to as umbilical elements and/or umbilicals.
- the first kind of stress as mentioned above is caused by vortex-induced alternating forces that vibrate the underwater structure in a direction perpendicular to the direction of the current. These are referred to as vortex-induced vibrations (VIV).
- VIV vortex-induced vibrations
- Subsea structures often have umbilical lines, pipes, electrical lines, cables, ropes, lift lines, and/or other smaller lines that run along the length of the structure. When the structure is initially installed these lines are sometimes fitted into insulation or buoyancy modules. However, when other lines are desired and are to be added, for example to run a line on the outside of the structure or after the structure has been installed, the lines need to held outside of the insulation or buoyancy modules. These additional lines then may interfere with the VIV and/or drag suppression devices that are installed exterior to the insulation or buoyancy modules.
- the invention provides a system including a subsea structure defining an interior of the system, the structure subject to a water current; a covering exterior to the subsea structure, covering at least a portion of an outside surface of the subsea structure, the covering selected from insulation and buoyancy modules; at least one additional line exterior to the covering; a collar exterior to the covering adapted to maintain the at least one line adjacent to the covering; and a vortex induced vibration suppression device exterior to the at least one line, the collar, and the covering.
- the invention provides a method of reducing drag and/or vortex induced vibration of a subsea structure, including installing the subsea structure in a body of water, wherein the subsea structure is subject to one or more water currents; installing a covering exterior to the subsea structure, covering at least a portion of an outside surface of the subsea structure; installing at least one line exterior to the covering; installing a collar exterior to the covering, the collar maintaining the at least one line adjacent to the covering; and installing a vortex induced vibration suppression device exterior to the covering, the at least one line, and the collar.
- Advantages of the invention may include one or more of the following: improved apparatus and methods for suppressing VIV; apparatus and methods for suppressing VIV that do not suffer from the disadvantages of the prior art; apparatus and methods for providing VIV suppression to a subsea structure comprising additionally installed lines and/or for providing protection to the additionally installed lines; and/or systems and methods of installing VIV suppression devices to a subsea structure with additionally installed lines.
- Figure 1 illustrates a subsea structure system
- Figure 2a illustrates a subsea structure system
- Figure 2b illustrates a side view of a riser with foam.
- Figure 2c illustrates a cross-sectional view of a riser with foam.
- Figure 2d illustrates a side view of a riser with foam.
- Figure 2e illustrates a cross-sectional view of a riser with foam.
- Figure 2f illustrates a cross-sectional view of a riser with foam and a fairing.
- Figure 3a illustrates a cross-sectional view of a riser with foam.
- Figure 3b illustrates a cross-sectional view of a riser with foam and a fairing.
- System 100 includes surface structure 102 near the water surface, which is connected to riser 104, which riser 104 is connected to subsurface structure 106, which is adjacent to seafloor 108.
- the water has current 1 10, which may cause vortex- induced vibration of riser 104.
- fairings 1 14 may be installed along the length of riser 104.
- Collars 1 12 are used to keep fairings from moving along the length of riser 104.
- system 200 is illustrated.
- System 200 includes surface structure 202 near the surface of the water, which is connected to riser 204.
- Riser 204 is also connected to subsurface structure 203 near the seafloor 208.
- Exterior to riser 204 is foam 206, which may serve to insulate and/or provide buoyancy to riser 204.
- Current 210 is in the water, which may cause VIV on riser 204 and foam 206.
- Foam 206 may contain one or more lines between surface structure 202 and subsurface structure 203. Additional lines 212 have been added after the installation of foam 206, so they are exterior to foam 206. Fairing holders 216 have been installed to hold additional lines 212 adjacent to foam 206. Fairings 214 are installed exterior to fairing holders 216. Fairing holders 216 are shown inside fairings 214, and serve to keep fairings 214 at a desired location along subsurface structure 203 and/or allow fairings 214 to rotate about fairing holders 216 without interfering with or being tangled with additional lines 212. One or more fairing holders 216 may be used for each fairing 214.
- riser 204 is shown with foam 206 exterior to the riser, one or more additional lines 212 have been run along the length of riser 204 exterior to foam 206.
- Fairing holders 216 have been installed to hold additional lines 212 adjacent to foam 206.
- FIG. 2c there is a cross-sectional view of riser 204 and foam 206.
- Riser 204 is in the interior. Exterior to riser 204 is foam 206, which is illustrated as two sections, 206a and 206b, which maybe connected around riser 204.
- Internal pockets 222 house lines 220, for example hydraulic lines, electrical lines, choke and kill lines, or other lines as are needed.
- Split-half pockets 226, defined between sections 206a and 206b, also house lines 220, and external pockets 224 also house lines 220.
- riser 204 and foam 206 are illustrated with grooves 21 1 spaced along the length of riser 204.
- Fairing holders 216 have been placed in grooves 21 1 .
- Grooves 21 1 serve to maintain fairing holders 216 at a desired location along the length of riser 204 and foam 206.
- Figure 2e a cross-sectional view of riser 204 and foam 206 is shown.
- Fairing holder 216 may have portion 216a with openings 216b and 216c, adapted to receive additional lines 212a and 212b, respectively. Fairing holder 216 may be fixed in place so that additional lines 212a and 212b can be held in place adjacent foam 206 by fairing holder 216.
- fairing 214 has been attached exterior to fairing holder 216.
- fairing 214 may be held open and pulled around foam 206 and fairing holder 216. Fairing is then closed around foam 206 and fairing holder 216.
- screws 232 may be attached to insert 230 to hold the two halves of fairing 214 together.
- Fairing holder 316 is attached exterior to riser 304 and foam 306.
- Fairing holder 316 may have a portion with openings 316a, 316b, and 316c, adapted to receive additional lines 312a, 312b, and 312c, respectively.
- Fairing holder 316 may be fixed in place so that additional lines 312a, 312b, and 312c can be held in place adjacent foam 306 by fairing holder 316.
- Fairing holder 316 may have a substantially constant thickness about riser 304 and foam 306 to allow a fairing to rotate about fairing holder 316.
- fairing 314 has been attached exterior to fairing holder 316.
- fairing 314 may be held open and pulled around foam 306 and fairing holder 316. Fairing is then closed around foam 306 and fairing holder 316.
- screws 332 may be attached to insert 330 to hold the two halves of fairing 314 together.
- Fairing holder 316 may also have axial protrusions (not shown) extending outwardly from its outer surface. Such protrusions may serve to keep a space between fairing holder 316 and fairing 314, and facilitate the weather vaning of fairing 314 about fairing holder 316. In addition, such protrusions may serve to keep a space between fairing holder 316 and lines 312a-312c and/or to prevent damage to the lines from the weather vaning of fairing 314 about fairing holder 316
- Fairings may be replaced with strakes, shrouds, wake splitters, tail fairings, buoyancy modules, or other devices as are known in the art.
- Suitable sleeves, suitable collars, and suitable devices to install exterior to structures, and methods of their installation are disclosed in U.S. Patent Application Number 10/839,781 , having attorney docket number TH1433; U.S. Patent Application Number 1 1 /400,365, having attorney docket number TH0541 ; U.S. Patent Application Number 1 1/419,964, having attorney docket number TH2508; U.S. Patent Application Number 1 1/420,838, having attorney docket number TH2876; U.S.
- the collars and/or fairings may be installed on the connector member before or after the connector member is placed in a body of water.
- the collars, fairings and/or other devices exterior to the structure may have a clamshell configuration, and may be hinged with a closing mechanism opposite the hinge, for example a mechanism that can be operated with an ROV.
- the collar may be a copper ring, or have a copper ring that is part of its structure.
- Fairings may be provided with copper plates on their ends to allow them to weathervane with adjacent fairings or collars. Fairings may be partially manufactured from copper.
- a biodegradable spacer may be placed between adjacent fairings to keep them from binding and allow them to weathervane after the spacer has degraded.
- a system including a subsea structure defining an interior of the system, the structure subject to a water current; a covering exterior to the subsea structure, covering at least a portion of an outside surface of the subsea structure, the covering selected from insulation and buoyancy modules; at least one additional line exterior to the covering; a collar exterior to the covering adapted to maintain the at least one line adjacent to the covering; and a vortex induced vibration suppression device exterior to the at least one line, the collar, and the covering.
- the subsea structure is selected from an umbilical, a riser, and a tendon.
- the covering comprises foam adapted to provide buoyancy and/or thermal insulation to the subsea structure.
- the vortex induced vibration suppression device comprises a fairing or a helical strake.
- the system also includes at least one old line exterior to the subsea structure, the at least one old line within the covering.
- a method of reducing drag and/or vortex induced vibration of a subsea structure including installing the subsea structure in a body of water, wherein the subsea structure is subject to one or more water currents; installing a covering exterior to the subsea structure, covering at least a portion of an outside surface of the subsea structure; installing at least one line exterior to the covering; installing a collar exterior to the covering, the collar maintaining the at least one line adjacent to the covering; and installing a vortex induced vibration suppression device exterior to the covering, the at least one line, and the collar.
- the installing the collar comprises installing at least two collars per vortex induced vibration suppression device.
- the vortex induced vibration suppression device comprises a fairing. In some embodiments, the vortex induced vibration suppression device is adapted to rotate about the subsea structure in response to the one or more water currents. In some embodiments, the collar is fixed in relation to the subsea structure, and maintains the vortex induced vibration suppression device at a desired location along a length of the subsea structure
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BRPI0811546-0A2A BRPI0811546A2 (en) | 2007-05-15 | 2008-05-13 | SYSTEM AND METHOD FOR REDUCING VORTICAL AND / OR TRAIL-INDUCED VIBRATION OF AN UNDERWATER STRUCTURE |
GB0918013A GB2463802A (en) | 2007-05-15 | 2008-05-13 | Vortex induced vibration suppression systems and methods |
MX2009011887A MX2009011887A (en) | 2007-05-15 | 2008-05-13 | Vortex induced vibration suppression systems and methods. |
NO20093494A NO20093494L (en) | 2007-05-15 | 2009-12-08 | System and method for suppression of vortex-induced vibration |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US93812507P | 2007-05-15 | 2007-05-15 | |
US60/938,125 | 2007-05-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008144293A1 true WO2008144293A1 (en) | 2008-11-27 |
Family
ID=40122117
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2008/063497 WO2008144293A1 (en) | 2007-05-15 | 2008-05-13 | Vortex induced vibration suppression systems and methods |
Country Status (5)
Country | Link |
---|---|
BR (1) | BRPI0811546A2 (en) |
GB (1) | GB2463802A (en) |
MX (1) | MX2009011887A (en) |
NO (1) | NO20093494L (en) |
WO (1) | WO2008144293A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011022332A1 (en) * | 2009-08-17 | 2011-02-24 | Shell Oil Company | Vortex induced vibration suppression systems and methods |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6702026B2 (en) * | 2000-07-26 | 2004-03-09 | Shell Oil Company | Methods and systems for reducing drag and vortex-induced vibrations on cylindrical structures |
US20050100414A1 (en) * | 2003-11-07 | 2005-05-12 | Conocophillips Company | Composite riser with integrity monitoring apparatus and method |
US20050163573A1 (en) * | 2001-10-19 | 2005-07-28 | Mcmillan David W. | Methods for remote installation of devices for reducing drag and vortex induced vibration |
US20060231008A1 (en) * | 2005-04-11 | 2006-10-19 | Donald Wayne Allen | Systems and methods for reducing vibrations |
-
2008
- 2008-05-13 MX MX2009011887A patent/MX2009011887A/en not_active Application Discontinuation
- 2008-05-13 BR BRPI0811546-0A2A patent/BRPI0811546A2/en not_active IP Right Cessation
- 2008-05-13 GB GB0918013A patent/GB2463802A/en not_active Withdrawn
- 2008-05-13 WO PCT/US2008/063497 patent/WO2008144293A1/en active Application Filing
-
2009
- 2009-12-08 NO NO20093494A patent/NO20093494L/en not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6702026B2 (en) * | 2000-07-26 | 2004-03-09 | Shell Oil Company | Methods and systems for reducing drag and vortex-induced vibrations on cylindrical structures |
US20050163573A1 (en) * | 2001-10-19 | 2005-07-28 | Mcmillan David W. | Methods for remote installation of devices for reducing drag and vortex induced vibration |
US20050100414A1 (en) * | 2003-11-07 | 2005-05-12 | Conocophillips Company | Composite riser with integrity monitoring apparatus and method |
US20060231008A1 (en) * | 2005-04-11 | 2006-10-19 | Donald Wayne Allen | Systems and methods for reducing vibrations |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011022332A1 (en) * | 2009-08-17 | 2011-02-24 | Shell Oil Company | Vortex induced vibration suppression systems and methods |
Also Published As
Publication number | Publication date |
---|---|
GB0918013D0 (en) | 2009-12-02 |
NO20093494L (en) | 2009-12-08 |
GB2463802A (en) | 2010-03-31 |
BRPI0811546A2 (en) | 2014-11-18 |
MX2009011887A (en) | 2010-02-17 |
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